"Larousse Gastronomique" is foundational in western cuisine. I like to cross refrence it with the "Oxford Companion to Food" to broaden knowledge base. Tie this with a basic cooking book like "On Cooking" and one will have an operational cooking reference source with understanding as opposed to just following directions. "On Food and Cooking," by Harold Magee, is simply a must to help discern truth. "Cooking with the Seasons" by Jean-Louis Pallidin inspires me still. On a contemporary note... The "Grand livre de Cuisine d'Alain Ducasse," both dessert book and savory book, is essential for today as it depicts recent history of culinary genius. "El Bulli 1998-2002," Ferran Adria, opens doors I never thought possible.